Suction box



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Dec. 1 ,-1925 M. D. PIGMAN suGTIoN BOX Filed June 14 1924 3 Sheets-Sheet 2 lwwgntolz, J/arbhymm 3&1, @my M7@ f Patented Dec. 1, 1925.

UNITED STATES MARLO D. PIGMAN, OF MIDDLETOWN, OHIO.

s UcrIoN Box.

Application filed June 14, 1924. Serial' No. 720,050.

To all 'whom z't may concern:

Be it known that I, MARLO D. PIGMAN, a citizen of the United States, residing at Middletown, in the county of Butler and State of Ohio, have invented certain new and useful Improvements in Suction Boxes, of which the following is a specification.

The invention relates to aper making machinery, and has as an object the provision of an improved suction box for use in many locations in such machinery.

An object of the invention is the provision of a suction box which shall be eiicient in use, simple to produce, and which shall reduce wear upon the felt upon which the pulp is carried.

Further objects of the invention will appear from the following description when read in connection with the accompanying drawing, in which- Fig. 1 is a perspective view;

Fig. 2 is a central vertical longitudinal section, broken away to reduce its length;

Fig. 3 is a detail section, similar to Fig. 2, the roll being-omitted;

FFig. 4 is an end view from the left of igs. 5 and 6 are transverse sections on line 5, 5 and 6, 6 of Fig. 2;

Fig. 7 is an end view from the right in Fig. 2;

1 ig. 8 is a perspective view of the bottom ate; p Fig. 9 is a perspective view of the filler strips;

Flg. 10 is a perspective view of the inner casing; and

Fi 11 is a detail diagrammatic view showing an application of the suction box of the present invention to a portion of a paper machine.`

As shown, the device comprises end castings 10 and 11, each having anges 12 and 13 inset from the edge, and carried along the upper and side edges for the reception of an outer casing 14, shown as rectangular in cross section, and comprisin three sides of a rectangular cylinder. e shell 14 is shown as seating upon the flanges 12 and 13, which are inset from the ed es of the castings 10, 11, sufficiently to a low the outer surface ofthe shell to become iush with the said edges. The shell may be secured to the alliiznges as by means of rivets, screws or the e. A ba'se for the device is shown in the form of aboard, preferably of wood, 15, shown in perspective 1n Fig. 8. Upon this board the castings 12, 13 may be secured, as by means of bolts 16 passing through the board and through the extensions 17, 18 upon the castings 10, 11. The edge of the casing 14 is shown as seating upon the board 15, and is provided with inturned flanges 19, 20 occupying a portion of the fourth side of the rectangular cylinder comprised by the casing 14.

To form a suction chamber within the casing 14, there is shown an inner casing 21, shown in perspective view in Fig. 10, comprising a substantially semi-cylindrical body provided with out-turned flanges 22 on its lower edge.

The out-turned flanges 22 are shown as seating upon the flanges 19, 20 and may bc securedv thereto, as by screws 23 passed through the two, and into the board 15. The ends of the casing 21 are shown as abutting against the end Walls of the castings 10, 11.

To permit fluid to flow from the interior of the'casing 21 to the space between the same and the casing 14, the flanges 22 are shown as cut away to provide slots 24 closely l adjacent to the lower portion of the suction chamber between the two casings.

To provide for the attachment of a suction pipe, the casting 11 is shown as formed with a cylindrical extension 25 over which a suction pipe may be slipped and secured in any desired manner. The inner end of the chamber 26 formed by the extension of the casting 11, is formed by a wall 27 of an outline upon the arc of a circle adapted to register with the end of the inner casing 21 to close the space within the casing 21 at this point.

To apply suction to a pulp bearing belt, there is shown a roller 28 journaled in cavities 29, 30 formed internally of the castings 10 and 11. The roller 28 is shown as formed with end members 31, 32 in the form of disks '33 bearing cylindrical flanges 34 and hub members 35, the latter provided with stub shafts 36 extending into the journal bearings 29, 30. Preferably the ends of the journal cavities 29, 30 are provided with counterbores, as at 37, 38. The shaft 36 ma be formed separate from the hubs 35 an inserted therein, the members 31 and 32 preferably being formed of cast material, such as brass. The material named is suitable material for all the metallic parts of the device, since it is not subject to rust.

The roll 28 is completed by means of a cylinder 39 -fttin over the flanges 34 of the hubs 31, 32, an shown as erforatedor formed of reticulated materia To provide a close fit with the surface of the cylinder 39, there are shown filler strips 40 41 fitting within the side bars 42, 43 o`f the bottom board 15. The inner surfaces, 44, 45 of the strips 40, 41 are shown formed upon arcs of a circle of slightly greater radius than the cylinder 28. As shown in Fig. 6, the roll 28 is adapted to project slightly below the surface of the board 15 and the filler strips 40, 41, and it is only the openings which are exposed to the external atmosphere through which suction applied through a pipe in connection with the extension 25 can act. Since the roll 28 projects sli htly as shown, the web will bear on the rol to almost the entire exclusion of friction against the immovable surface of the board 15, thereby greatly reducing the wear upon the web.

The action of the device will be obvious from the above description. The box will be placed so that the traveling web bearing thc pulp will be in contact with the surface of the roll 28 when the web being drawn therealong will cause revolution of the roll, and suction being applied through the pipe 25 will cause water to be extracted from the web and pulp, to be drawn to the interior of the roll through the perforations or reticulations, through the slots 24 to the interior of the outer chamber between the castings 13 and 21, and away through suction pipe. The application of the device to a machine is diagrammatically shown in Fig. 11, wherein the box is placed above the felt to the lower surface of which the paper material is adhering and preferably closely adjacent a couch roll. Obviously, one of the devices may be placed adjacent each of the couch rolls of a machine.

Minor changes may be made in the physical embodiment of the invention without departing 'from its spirit and within the scope of the appended claims.

I claim:

1. A suction box comprising, in combination, inner and outer spaced casings providing a chamber therebetween, means to apply, suction to said chamber, a forammous roller housed within said inner casing, means for communication between the interior of said inner casing and said chamber, said roller adapted to be operated in contact with the web of a paper making machine.

2. A suction box comprising, in combination, inner and outer casings s aced to provide a suction chamber there tween, said casing seated upon a base board having a roller slot, a foraminous roller housed within said inner casing projecting through said slot, means to produce suction within said chamber, andmeans providing communication between said chamber and the interior of said inner casing whereby water may be drawn from a pulp-bearing web in contact with said forammous roller.

3. A suction box comprising, in combination, inner and outer casings s aced to provide a suction chamber there etween, said casing seated upon a base board having a roller slot, the edges of said slot formed to closely fit the surface of the roller, a foraminous roller housed within said inner casing projectin through said slot, means to produce suction within said chamber, and means providing communication between said chamber and the interior of said inner casin whereby water may be drawn from a pu p-bearing web in contact with said foraminous roller.

4. A suction box comprising, in combination, end members each having a shoulder adjacent its edge, an outer casing seated upon said shoulder, an inner casing'spaced from said outer casing and abutting against the inner surface of said end members, said inner casing having passages placin its interior in communication with said c amber, means carried by one`of said members for attachment of a suction pi e in communication with the chamber, a oraminous roller journaled in said members and housed within said inner casing, a base board having a longitudinal slot through which said rollerA protrudes, the ed es of said slot closely fitting the surface o? said roller whereby moisture may be drawn from a pulp-bearing web in contact with a rotruding portion of the surface of said ro er.

5. A suction box comprising, in combination, end members, an outer casing joined to said end members having an open sideA with edge anges extending into said o ening, an

mner casing having outward y turned flanges seating upon said inturned flanges, the ends of said inner casing abutting the inner surface of said members 4whereby a chamber is provided between said casings, a foraminous roller journaled in said members andhoused within said inner casing, a base board upon which said members and outer casing seat and rovided with a slot through which said rol er protrudes, the edges of said slot formed to closely fit the surface of4 saidroller, means carried by the exterior of the device for attachment of a suction pipe to exert suction within said chamber sald -inner casing having passages to place lts interior in communication with said chamber, whereby moisture may be drawn from a pulp bearing web in contact with a rotruding portion of the surface of said rol er.

MARLO D. PIGMAN. 

